1，反射的方式
这个可以参考我这篇文章
https://www.jianshu.com/p/feb7fd5fa84e
private void setTimePickerDividerColor(TimePicker timePicker) {
LinearLayout llFirst = (LinearLayout) timePicker.getChildAt(0);
LinearLayout mSpinners = (LinearLayout) llFirst.getChildAt(1);
for (int i = 0; i < mSpinners.getChildCount(); i++) {
if (mSpinners.getChildAt(i) instanceof NumberPicker) {
Field[] pickerFields = NumberPicker.class.getDeclaredFields();
setPickerMargin((NumberPicker) mSpinners.getChildAt(i));
for (Field pf : pickerFields) {
if (pf.getName().equals("mSelectionDivider")) {
pf.setAccessible(true);
try {
pf.set(mSpinners.getChildAt(i), new ColorDrawable());
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (Resources.NotFoundException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
break;
}
}
}
}
}
属性：mSelectionDivider 的修改
2，直接修改
public static void showToast(String text, int gravity) {
if (textview_id == 0)
textview_id = Resources.getSystem().getIdentifier("message", "id", "android");
((TextView) toast.getView().findViewById(textview_id)).setGravity(gravity);
showToast(text);
}
textview_id 通过 Resources.getSystem().getIdentifier("message", "id", "android") 获得，然后((TextView) toast.getView().findViewById(textview_id)).setGravity(gravity); 直接修改
3，自定义
未完待续
